Introduction • On Precision Pots • General Product Definitions • Construction Details • Multiturn Precision Pots • Resistive Elements • Terminals • Shaft-Rotor Assembly • Mechanical Rotation • Mounting Methods • 3540 Family • 3590 Family • Knobpot 3600 Family • Single-Turn Precision Pots • 6537/6637 Family • 6539/6639 Family • 3680 Pushbutton Family • Special Precision Pots • Shafts • Mounting Styles • Bearings • Torque • Linearity • Wiper Load • Low Current Applications • High Rotational Speed • Angles • Additional Taps • Sealed Units • Multicup Assemblies • Envelopes • Environmental • Competition • Useful Terms

Multiturn Precision Potentiometers

The following section will discuss the piece parts, assembly and features of multi-turn potentiometers. Highlights of each model family will also be reviewed.

Housing

The housing for a multi-turn has helical grooves inside to hold the element in place as shown in Figure 11.1. This aspect demands that the housing demonstrates a high degree of dimensional stability when subjected to temperature changes and moisture. The element is fixed in place by cementing the ends to the housing.


Figure 11.1